Does exist on the market a differentiator device? Basically connected to a multiway switching to output a pulse of defined length everytime the deviator changes position on/off?
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Discuss Does exist on the market a differentiator device? in the UK Electrical Forum area at ElectriciansForums.net
Ok, I explain it better:if V1 is rectified and unipolarity there will need to be a DC path around the capacitor.
It's not now clear to me what supply you have available - AC or DC and at what voltage - and what the nature of the control input is; logic level, a relay coil or what? How far is the switch from the controller? Is it preferable to locate the circuit near the switch or the controller?
Although it is possible to construct a general-purpose circuit that is independent of most of the above parameters, the easiest and smallest implementation will probably benefit from being matched to the specific operational environment.
I understand your requirement is to produce a timed on pulse whenever the switch transitions on to off OR off to on.Ok, I explain it better:
The input line at 230Vac (+/-20%) 50Hz is switched on/off, with this signal has to be generated a pulse of time in the range of 0.5 to 2sec to act on a 230Vac load (the gate opener).
Any other voltages needed (i.e. relay coil at 24V) should be taken by voltage step down from 230Vac.
I seek the easiest solution: from market or custom designed.
The 230V control switch can be several meters from the load (gate opener).
I understand your requirement is to produce a timed on pulse whenever the switch transitions on to off OR off to on.
To my great shame I have never designed nor constructed or worked on small thermionic valve circuitry. The larger tubes yes. So I will leave the ECC82 technology demonstrator for you to do.Excellent toolbox parts solution. I have in mind a single-package solution using an LM339 - a=input buffer, b=inverter, a couple of diodes and c + d=window detector.
I have to admit that many of my quick solutions these days are just PICs. As much as I like to design circuits, I can usually get there faster by programming. On one occasion I had so little time to make a gizmo to send abroad, I built the hardware and sent an in-circuit programming cable with it, then while it was in transit built a copy, programmed and debugged it and then sent the hex file for the end user to upload. At the moment of dispatch I hadn't actually worked out any of the logic or math, and there was quite a lot of floating point that I didn't have a hope of programming in time. By building generic hardware, I didn't need to think about it at that stage.
But I do like tricky hardware solutions. I am seeing an opto-isolator inside a bridge rectifier, maybe a unijunction transistor. How about a couple of ECC82s? What about triggering on the transit time of a C/O relay contact? Two mercury switches connected by a spring?
So I will leave the ECC82 technology demonstrator for you to do
Hi Marconi,By ‘gate opener’ do you mean ‘lock’ for security? Or do you mean servo actuator to open the gate using electrical energy?
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